JP Jordaan1, Andre Van der Kouwe1,2, Ali Alhamud1,3,4, and Ernesta M. Meintjes1,3
1Department of Human Biology, University of Cape Town, Cape Town, South Africa, 2Athinoula A. Martinos Centre for Biomedical Imaging, Massachusetts General Hospital, Massachusetts, MA, United States, 3Cape Universities Body Imaging Centre (CUBIC-UCT), University of Cape Town, Cape Town, South Africa, 4MRI Research Unit, University of Tripoli, Tripoli, Libyan
We explored the use of digital low-pass filters to reduce the acoustic noise produced during DTI acquisitions, focusing mainly on the EPI readout. The filters attenuate the high-frequency harmonics of the gradient waveforms which results in reduced spectral content of the mechanical vibrations induced in the gradient coil assembly. Results showed a reduction of 2.9 dBA for peak sound pressure level (SPL) and 2 dBA for equivalent continuous sound level (Leq) with no acquisition time penalty or reduction in image quality. The proposed method has the potential to be generalized to most gradient waveforms.
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